For example the case of motor bearing, bearing reflect better performance, longer life

Can also be referred to as the motor bearings, motor bearing is special bearing in motor, motor bearing in use process may appear some fault, lead to bearing damage, which is bearing failure unable to function properly, in order to let everyone know about these situations have more specific, the bearing network ( Hereinafter referred to as:) To share the case of motor bearing as an example, hope to be able to help you later to reflect better performance, longer service life of motor bearing. 1 is shown in figure 1, fault motor bearing is bearing the overall appearance, the fault bearing appearance overall integrity, no missing parts, can still turn. But the earthquake; After removed the seals, visible inside the oil is dry powder adhesive in outer surface, such as cage, shown in figure 2. Figure 1 bearing overall appearance figure 2 bearing internal morphology cutting bearing outer ring and bearing decomposition, the partial channel of inner ring raceway obvious wear, nearly half cycle race wear serious, to the literal, the area of the surface of the inner diameter significantly high temperature blue, significant wear and tear parts were not contact trajectory, still can be seen clearly biased literal, as shown in figure 3. Inner ring corrosion behavior of type end have obvious discoloration micro contact traces, the local has formed the steps, as shown in figure 4. Figure 3 raceway eccentric wear morphology in figure 4 the type face and micro corrosion morphology bearing outer ring color is normal, not seen high temperature phenomenon, raceway adhere to a large number of oil dirty, visible basic complete of raceway shape after cleaning, no flaking and obvious wear and tear, by the dozen literally river bank obvious edge phenomenon, careful observation, raceway contact trajectory to the literal side, as shown in figure 5, figure 6. Figure 5 outer raceway adhesion oil scale figure 6 outer raceway eccentric wear contact trajectory keep on visible to a large number of oil scale, on one side, the more the diameter guide surface has obvious wear and matrix materials, two and a half cage riveting state intact, pocket hole on the two side there is a clear and wear characteristics, shown in figure 7 ~ 9. Bearing the type face side had obvious wear white teflon sealing ring inside diameter, shown in figure 10. Other parts no exception. Figure 7 cage surface oil scale figure 8 cage guide surface wear morphology figure 9 cage pocket hole on both sides of the wear morphology figure 10 sealing ring diameter wear morphology of the expiration of 2, the service life of the bearing below we get 2 sets of termination of the service life of the bearings, also to cutting outer decomposition, inner and outer ring raceway, steel ball and cage guide surface and hole contact traces are normal, Numbers for 2 # of bearing inner ring than typing end face is also similar to the bearing fault characteristics of micro corrosion as shown in figure 11, figure 12. Figure 11 inner ring not typing section morphology convex figure 12 # 2 inner ring corrosion behavior of type cross section micro morphology of the size of the 2 sets of bearings, rotating precision and accuracy after clearance test, learned that in addition to the 2 # place outside slightly out-of-tolerance bearing inner groove, other test results conform to the requirements of the standard, 2 # bearing inner groove pendulum out-of-tolerance and its reference face ( The literal) There is an obvious micro corrosion. Again for fault bearing structure and hardness tests, the results show that the set of carbide precipitation and steel ball core organization, coat quenching tempering for level 3, inside, coat of raceway surface layer is a layer of organizational change, illustrate bearing ring raceway and the phenomenon of high temperature occurred on the surfaces of steel ball. 3, comprehensive analysis, under normal circumstances, deep groove ball bearings work path should be in the groove, but the fault bearing inner and outer ring raceway and the obvious effect of the steel ball contact tilted, and inner ring raceway and the outer ring raceway are obvious corresponding slant groove wear characteristics, to show that the bearing work bear a large axial force in the process. Larger axial force in the position of bearing parts work abnormal, the abnormal friction, wear and tear parts contact surface, produce a lot of friction heat, make the bearing internal temperature, grease performance, such as base oil evaporate faster, dry and harden, grease lubrication performance degradation, intensifying the inside of the bearing friction, wear, clearance, bearing operation instability, oscillation, accelerate the failure of the bearing. Fault bearing inner ring on one side of the face is micro corrosion phenomenon, the side face should be cooperate with shoulder surface, analysts say, the generation of bearing axial force at work should be related to the generation of the phenomenon. From one side of bearing inner ring raceway exists partial grinding characteristics and on the other side end face to determine micro corrosion phenomenon, inner ring under the direction of the axial force should be from the inner ring end face no contact traces side ( The lateral) To have a side (micro corrosion Shoulder side) Bearing installation parts diagram, as shown in figure 13. Bearing inner ring end face and shoulder causes of micro corrosion is bearing and the shaft shoulder to rely on tight, and repeated the results of the axial force effect, the effect may be the result of the bearing inner ring and the shaft axial movement ( To the outside) , then if the bearing does not produce additional axial force, need of bearing outside diameter and bearing hole with enough clearance can be moved, axial if bearing outside diameter and bearing seat with tight hole, the bearing outer ring in the inner ring ( To the outside) Cannot free reply, after moving in bearing normal work make the bearing inner ring produces a ( Inward) The additional axial force. Bearing the type face side had obvious wear white teflon sealing ring inside diameter, further illustrate bearing axial force direction from the inner ring type to the type. Figure 13 bearing installation parts diagram by the analysis results show that the fault bearing failure pattern for high temperature wear failure. Bearing failure reason is in the process of work under the additional axial force.